Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 13: Nanostructures at Surfaces 2

O 13.3: Vortrag

Montag, 5. September 2022, 15:30–15:45, S052

Ni kagome lattice on Pb(111) — •Gustav Bihlmayer¹, Yen-Hui Lin², Stefan Blügel¹, and Pin-Jui Hsu² — ¹Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich, D-52425 Jülich, Germany — ²Department of Physics, National Tsing Hua University, Hsinchu, 30013, Taiwan

Deposition of atomically thin films on well-ordered surfaces sometimes allows realizing new structural motives that have no correspondence in the bulk phases. Here we observe that, at low temperatures, submonolayer growth of Ni on a Pb(111) substrate leads to well-ordered, hexagonal islands. In scanning tunneling microscopy (STM) two types of edges with very different apparent height and scattering properties are observed. From density functional theory (DFT) calculations and STM images with atomic resolution we conclude that the Ni atoms form a kagome lattice and the islands show saw-tooth edges. Comparison of STM and DFT data suggests that some Ni atoms are incorporated in the subsurface layer and give rise to the low observed height of the islands and the strong difference observed at their edges. From the DFT calculations we conclude that the Ni island is non-magnetic and the electronic structure shows some characteristics of the kagome lattice, i.e. flat bands also visible in scanning tunneling spectra.